mahony



(No Model.) 2 Sheets-Sheet 1.

J. J. MAHONY.

DUMB WAITER STOP.

No. 367,152. Patented July 26, 1887.

J m. o kw 2 AH V I my p I a f v To all whom it may concern.-

UNITED STATES PATENT OFFICE.

JOHN J. MAHONY, OF SAN FRANCISCO, CALIFORNIA.

DUMB-WAITER STOP.

SPECIFICATION forming part of Letters Patent No. 367,152, dated July 26,1887. Application filed May 11, 1887. Serial No. 237,905. (No model.)

Be it known that I, JOHN J. MAHONY, of the city and county of SanFrancisco, State of California, have invented an Improvement inDumb-Waiter Stops; and I hereby declare the following to be a full,clear, and exact description of the same.

My invention relates to that class of reciprocating elevators commonlyknown, from the use to which they are put, as dumbwaiters', and tocertain improvements with respect to the mechanism by which they arestopped at any desired point in the course of their travel.

Theseiinprovements are of the same general nature as those shown in myPatent No.

856,948, dated February 1, 1887 but they are herein greatly simplified,many of the parts being omitted and all springs being dispensed with. 1

My invention consists in the combination and arrangement of the pivotedgravityeatch,

' tively stopping the waiter at points at which it is intended to rest,thereby doing away with the necessity of friction to effect the result.

The particular object is to provide mechanism of a simple and effectivecharacter,which will operate certainly and without noise.

Referring to the accompanying drawings for a more complete explanationof my invention, Figure 1 shows the stop in position going up. Fig. 2shows the stop in position of rest. Fig. 3 shows the device raised toclear the catch. Fig. 4 shows it descending. Fig.5 is a horizontalsection. Fig. 6 is a detail of a portion of the lever F, showing theshoulder f.

A is the well or shaft, having the guides a. B is the dumb-waiter,mounted in the well and adapted to move up and down therein.

The waiter is suspended by means of a rope, which may be supposed toextend upwardly, and after passing over a suitable pulley to extend downagain, and to be provided with a weight, as usual;

To the side of the guide a (or otherwise secured inthe well or shaft) isfixed a rack or strip, D, which has on one edge an inclined notch, 66,the base of which terminates in a straight shoulder, d. The lower end ofthe strip is beveled at (1*, and its upper end has its has a weight, w,the tendency of which is to throw the other end up; but this movement,as well as the reverse movement of said triplever, is limited by reasonof the shoulder f on the weight end coming in contact with the edge ofthe catch-lever E below or above, as the case may be.

The operation is as follows, supposing the waiter to be in the posit-ionshown in Fig. 1: It will be seen that the catch-1ever E is thrown overagainst its stop 6 and the trip is raised by its weight, so that itsshoulder f is stopped by the edge of the catch-lever below. Now, uponmoving the waiter up the operative end of the trip-lever co mesincontact with the beveled low er end of the strip D, and is turned on itspivot until limited'by its shoulderf coming in contact with the edge ofthe catch-lever above, and in this position its end lies-practicallyflush with the-edge of the catch-lever. Both levers now pass the lowerend of the strip D, and when they reach the shoulder d of said stripboth are thrown into it by the action of the weight W of thecatch-lever, the lower end of said lever resting in the shoulder, andthereby supporting the waiter, as is shown in Fig. 2. Now, in order tolower the waiter it is first moved up still higher until both levers arefree of the strip D, which has prevented the trip-lever from fallingback, whereupon said lever being new free falls back to its originalposition and the catchlever is limited by the stop 6 so as not to be inthe line of the upper end of the strip, which for this purpose isslightly out back at (1 Now, the waiter is started down, and the end ofthe trip-lever coming in contact with the upper end of the strip andbeing stopped by the engagement of its shoulderf with the edge of thecatch-lever is forced over to one side and carries the catch-lever withit, so that as it passes down the face of the strip it holds the lowerend of said catch-lever away from the strip and allows it to pass theshoulder d without touching. As soon as the lower end of the strip hasbeen passed, the parts return to position under the influence of theirrespective weights.

Having thus described my invention, what I claim as new, and desire tosecure by Let ters Patent, is

1. In combination with a dumb waiter mounted and suspended so as to bereciprocated, a strip in the well or shaftin whichthe waiter moves,having a shoulder on its inner face, a pivoted weighted lever secured tothe waiter and having its lower end adapted to engage the shoulder ofthe strip, thereby supportingthe waiter, and an oscillating weightedtrip-lever connected with the catch-lever and adapted to come in contactwith the face of the strip, whereby it forces the catch-lever over fromthe face of the strip, thereby allowing its descent, substantially asherein described.

2. In combination with a reciprocating dumb-waiter, the mechanism forsupporting and relieving it, consisting of a strip in the well or shaft,having a shouldered face, avi- 3. The dumb-waiter stop consisting of thevibrating weighted catch-lever pivoted to the waiter, the oscillatingweighted trip -lever pivoted to the catch-lever and having a shoulder bywhich its movement is limited, the fixed stop by which the movement ofthe catch-lever is limited, and theraek-strip D in the well or shaft inwhich the waiter moves, having a shoulder with which the catch-leverengages to support the waiter anda face against which the trip-leverplays to free the catch-lever of the shoulder, substantially as hereindescribed.

In witness whereof I have hereunto set my hand.

JOHN J. MAIIONY.

\Vi tn ess es:

0. D. COLE, J. H. BLooD.

